#include "stdio.h"
int main(){
    char str1[] = "Hello ";
    char str2[] = "Nihao";
    char str3[200];
    int i = 0,j = 0;
    while (str1[i] != '\0' ){
        str3[i] = str1[i];
        i++;
    }
    while (str2[j] != '\0' ){
        str3[i++] = str2[j];
        j++;
    }
    str3[i] = '\0';
    printf("%s",str3);
    return 0;
}